bug#11484: 23.4; Scrolling leaves traces of old text behind

[Achim Gratz]

Daniel Colascione writes:
> Are displays still slow enough that we have to care about graphics 
> optimization
> at this level?

Yes, at least for certain combinations of X server and graphics card
driver.  Also, the combination of Emacs and Gtk+ seems to trigger a
codepath in the display driver that is especially slow, even more so if
scroll-bars are switched on.  On my RV350-based AGP card this makes
Emacs' display updates about 80x slower than usual and I can assure you
that this is very noticeable (and annoying).


Regards,
Achim.
-- 
+<[Q+ Matrix-12 WAVE#46+305 Neuron microQkb Andromeda XTk Blofeld]>+

Waldorf MIDI Implementation & additional documentation:
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